Section E: Variation And Selection Flashcards
1
Q
What is a double helix?
A
A DNA molecule has two strands coiled together in the shape of two spirals.
2
Q
What is a mutation in a gene?
A
When DNA duplicates, mistakes are made and wrong nucleotide is used. This causes gene mutation.
3
Q
What is a phenotype?
A
The feature that results from the genotype.
4
Q
What is a genotype?
A
Describes the alleles each cell has for a certain feature.
5
Q
What are alleles?
A
Different versions of the same gene.
6
Q
What does homozygous mean?
A
Two alleles the same.
7
Q
What does heterozygous mean?
A
Two different alleles for that particular gene.
8
Q
What are the four main bases in the DNA code?
A
Adenine
Thymine
Guanine
Cytosine
